2016-06-06, 18:03
I've tried to reproduce this every which way but, I'm sorry to say, I'm unable to. As a workaround, you could edit the shortcuts/template.xml file to remove the different slide animations used for different number of items in the widgets. Line 1207, remove all of the animation elements (in both groups - 'Layout slide' and 'Wide layout slide') with:-
With that, the only way any given widget shouldn't show in the vertical menu is if there aren't any items to display, though if there's less than the full number needed to fill the space, the gap will be to the right of the list rather than the left.
Code:
<animation effect="slide" start="0,0" end="-2015,0" time="0" condition="True">conditional</animation>
With that, the only way any given widget shouldn't show in the vertical menu is if there aren't any items to display, though if there's less than the full number needed to fill the space, the gap will be to the right of the list rather than the left.